US Bridges

US 101 over Sol Duc River

Poor

Clallam County, Washington · 10.5 N JCT SR 110 · Structure no. 0002627B0000000

Built
1941
84 years old
Condition
Poor
inspected March 2023
Type
Truss - Thru
Steel
Length
248 ft
1 main span
Daily traffic
3,278
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Sol Duc River is a steel truss - thru carrying US 101 over Sol Duc River in Clallam County, Washington. It was built in 1941, so it is 84 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 3,278 vehicles a day, roughly 11% of them trucks, projected to reach 4,094 by 2039. The structure is 248 ft (75.6 m) long and 27 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesUS 101
CrossesSol Duc River
Location10.5 N JCT SR 110
RouteU.S. Route 101
CountyClallam County
StateWashington
Coordinates48.06953, -124.28525
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.9 US tons
Inventory rating20.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length248 ft (75.6 m)
Longest span160 ft (48.8 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic3,278 (2023)
Projected traffic4,094 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Sol Duc River built?

It was built in 1941, making it 84 years old in 2025.

What condition is US 101 over Sol Duc River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does US 101 over Sol Duc River carry?

About 3,278 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 101 over Sol Duc River?

The structure is 248 ft (75.6 m) long with a longest span of 160 ft (48.8 m) and a deck 27 ft wide.

Who owns US 101 over Sol Duc River?

It is owned by the State Highway Agency.